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(Nd Model.) 2 sheetssheet 1. v

HIP, HOLLY. v PRESSURE REDUCING VALVE.

No. 551,966. Patented Dec.v24, 1895.

WITNESSES. INVENTDR,

immodel. 2 Sheets-Sheet 2.

/ Y El P- PRESSURE REDUCING VALVE.

"No. 551,966.. Patented Dec. 24, 1895.

WITNESS Es. \NVEN TnR.

NrrED STATES ATENT EroE.

EDGAR P. HOLLY, or PROVIDENCE, RHODE ISLAND.

PRESSU RE-REDUCING VALVE.

, SPECIFICATION forming part of Letters Patent No. 551,966, dated December 24, 1895.

Application filed May 1, 1895. Serial NO- 5&'7,'730. (N0 model.)

To all whom it may concern.-

Be it known that I, EDGAR P. HOLLY, of Providence, in the county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Pressure- Reduc-ing Valves;-and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, which form a part of this specification.

This invention relates to the class of valves known as pressure-reducing valves, and has for its object to reduce the pressure of steam, &c., from a higher to a lower pressure in delivering the same for any purpose and to maintain the lower pressure automatically so long as the delivery goes on. It is an improvement on the invention described in my United States Letters Patent No. 533,953, and acts upon the same principle. It is fully explained and illustrated in this specification and the accompanying drawings.

Figure 1 is a vertical section taken through the center of the chambers of the valve and connecting pipes and parts, excepting the valve -disk, its stem and adj Listing-screw, which are shown in elevation. Fig. 2 shows, mainly in section, a modification of the Valve, it being substantially a double valve or a combination of two sets of the devices shown in Fig. 1, arranged to give a still greater reduc tion of pressure than can well be made with one valve. Fig. 3 is a horizontal section taken on a line as a; in Figs. 1 and 2. Fig. l repre sents a horizontal section taken on line .2 ,z in Fig. 2.

The valve consists of a chamber A, Fig. 1, to receive the steam to be reduced to a lower pressure through an opening or pipe connection A, and an upper chamber B to receive the steam from the chamber A and deliver it at a reduced pressure through the opening or pipe connection B. A passage A is made in the division between the two chambers 'A and B for the steam to pass through. A circular disk C, having a flat face on its under side, with the exception of a small portion cin the center a little larger than the passage A This disk 0 should have several times the area-say four timesof the passage A that it covers. A central stem passes through the disk 0, and that portion of it (0) that projects from the upper side of it enters a guide 6 in the upper part of the chamber B, and a shoulder 0 on the stem prevents the disk from rising too high. That part of the stem O below the disk extends down and enters a guide E, preferably cast integral With the bottom of the chamber A. In my patent before referred to this guide E was made in the end of an adj usting-serew E, entering through the bot tom of the chamber, and was very liable, owing to the movement of the screw, to have the axis of its hole thrown out of agreement with the seat of the valve, so that the disk guided by it would not set down close on all sides of the passage A I11 this way of making the guide the hole in it is bored at the same time that the disk-seat aroundthe passage A is faced off, and a perfect agreement between the hole and the disk is securedthat is, it will not change. that enters'the guide E has a series of annular grooves made in it to retain a little oil or water of condensation to serve as a dash-pot to prevent sudden motions or chattering of the disk. The face of the disk O is turned off from its periphery onto a circle a little larger than the passage A so as to have a portion 0 of the face large enough to cover the passage about one-hundredth part of an inch higher than the surface turned off to facilitate the action of the valve. An adjusting-screw E is put in through the chamber A The portion of the stem 0 to bear against the lower end of the stem 0 to raise the disk when necessary, and a stuffing-box d is placed around the stem of the screw in the usual way to keep it tight.

In Fig. 2 is shown a modification of the valve for making still greater reduction of pressure than can advantageously be done with one disk. pressure chamber B which stands in the same relation to the first reduced-pressure chamber B that that chamber stands to, the full-pressure chamber A. It has most of the parts, such as the passage between the cham hers, a disk C to cover the passage, the stems on the disk, and the guide with the dash-pot, but without the raising-screw at the lower end of the stem, which it is found is not required It consists in adding a second reducedhere.

A housing S is put around the valve from the lower edge of the chamber B up to the lower edge of the chamber B to improve the appearance of the valve as a whole.

In operation the high-pressure steam received into the chamber A through the opening A in passing into the chamber B is reduced in pressure to a given amount. Then in passing into the chamber B it suffers in like manner another reduction. As before stated, When a great reduction is required it can be more advantageously done by making the reduction in two successive operations than with one disk at one operation.

Having thus described my improvement, I claim as my invention and desire to secure by Letters Patent- 1. In a pressure reducing valve the combination of a high pressure chamber, a reduced pressure chamber, a passage connecting said chambers,a disk several times larger than said passage to coverit, stems projecting from both faces of the disk, a guide made integral with the case of thehigh pressure chamber to receive the stem 011 the under face of the disk, said stem having annular grooves made in that part fitting into said guide, an adjusting screw passing up through guide to raise the disk, substantially asherein described.

2. In a pressure reducing valve ahigh press ure chamber, a reduced pressure chamber, a passage connecting said chambers, a disk several times larger than said passage to cover it,- stems projecting from both faces of the disk, a guide made integral with the case of the high pressure chamber to receive the stem on the under face of the disk, said stem having annular grooves made in that part fitting into said guide an adjusting screw passing up through guide to raise the disk in combination with a second reduced pressure chamber, a passage from the first reduced pressure chamber to the second, a-disk larger than the passage to cover it; stems on both faces of said disk, a guide made integral with the first reduced pressure chamber to receive the stem on the under face of the disk, said stem hav ing annular grooves made in it, substantially as described.

EDGAR P. HOLLY.

lVitnesses CHAS. L. HUBBARD, BENJ. ARNOLD. 

